Make QuicCryptoClientConfig only cache server configs for 1 week.

net/quic/core/quic_constants.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_QUIC_CONSTANTS_H_
 #define NET_QUIC_QUIC_CONSTANTS_H_
 
 #include <stddef.h>
 #include <cstdint>
 #include <limits>
 
 #include "base/macros.h"
 #include "net/quic/core/quic_types.h"
 
 // Definitions of constant values used throughout the QUIC code.
 
 namespace net {
 
 // Simple time constants.
 const uint64_t kNumSecondsPerMinute = 60;
 const uint64_t kNumSecondsPerHour = kNumSecondsPerMinute * 60;
+const uint64_t kNumSecondsPerWeek = kNumSecondsPerHour * 24 * 7;
 const uint64_t kNumMicrosPerMilli = 1000;
 const uint64_t kNumMicrosPerSecond = 1000 * 1000;
 
 // Default initial maximum size in bytes of a QUIC packet.
 const QuicByteCount kDefaultMaxPacketSize = 1350;
 const QuicByteCount kDefaultServerMaxPacketSize = 1000;
 // The maximum packet size of any QUIC packet, based on ethernet's max size,
 // minus the IP and UDP headers. IPv6 has a 40 byte header, UDP adds an
 // additional 8 bytes.  This is a total overhead of 48 bytes.  Ethernet's
 // max packet size is 1500 bytes,  1500 - 48 = 1452.
@@ skipping 145 matching lines @@
 // duplicated.
 const size_t kDiversificationNonceSize = 32;
 
 // The largest gap in packets we'll accept without closing the connection.
 // This will likely have to be tuned.
 const QuicPacketNumber kMaxPacketGap = 5000;
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONSTANTS_H_